Dial/Analogue Compression Testing Machine

This is a hydraulic, electrically operated unit, designed
for conducting compression tests on concrete specimens up to 20 cm. Diameter
(or width and depth) and 30 cm, in height and also rocks and various other
materials. Cold Crushing Strength (CCS) test is also possible. The machine
consists of a steel cross head and cast iron base with two pillars
connecting the base and cross head by means of nuts. The hydraulic jack is
fixed to the base. The upper platen has got a self aligning action and is
attached to a screw which passes through the cross head and can be raised or
lowered for initial clearance adjustment. The lower platen rests on the jack
ram and is positioned with the help of a centering pin. Loading is
accomplished by the upward movement of the lower platen. The motorised
pumping unit is of plunger type and is connected to the jack by means of a
steel connecting tube.

A maximum red pointer is provided to facilitate taking of the readings
after failure of specimens. The pressure gauges of 20 cm dia.With isolating
valves are fixed on the pumping unit at an angle for easy readability.

The machine is fitted with control which enables the rate of application of
load to be varied. The machine is equipped with facilities for hand
operation as well.

The electrical pumping unit is fitted with three micro switches one for
each pressure gauge and will switch off the machine automatically as the
load on the machine approaches its full capacity of the gauge in case the
isolating valves are not operated. This will protect the pressure gauges and
the whole unit so that in case of break down of power supply, the machine
will stop and will not restart unless the starting switch is operated.

The machine satisfies the essential specifications of Indian Standard No.
516-1959. For operation on 415 Volts, 3-ph or 230 Volts, 1-ph A.C.